| 2003 | Ramesh K. Agarwal | Washington University | St. Louis |
| 2003 | Harry Sauer | University of Missouri | Rolla |
| 1997 | Richard Hagni | University of Missouri | Rolla |
| 1996 | William J. James | University of Missouri | Rolla |
| 1995 | Dorothy J. Feir | St. Louis University | Saint Louis |
| 1994 | John T. Park | University of Missouri | Rolla |
| 1993 | Daniel F. Milligan | University of Missouri | Columbia |
| 1992 | Rabindra Roy | Drury University | Springfield |
| 1990 | Peter H. Raven | Missouri Botanical Gardens | St. Louis |
| 1989 | Abraham Eisenstark | University of Missouri | Columbia |